78020577 has 20 divisors (see below), whose sum is σ = 121619520. Its totient is φ = 49751064.

The previous prime is 78020567. The next prime is 78020603. The reversal of 78020577 is 77502087.

78020577 is a `hidden beast` number, since 7 + 80 + 2 + 0 + 577 = 666.

It is not a de Polignac number, because 78020577 - 2²⁰ = 76972001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78020507) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19077 + ... + 22802.

It is an arithmetic number, because the mean of its divisors is an integer number (6080976).

Almost surely, 2^78020577 is an apocalyptic number.

It is an amenable number.

78020577 is a deficient number, since it is larger than the sum of its proper divisors (43598943).

78020577 is a wasteful number, since it uses less digits than its factorization.

78020577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41914 (or 41905 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 36.

The square root of 78020577 is about 8832.9257327343. The cubic root of 78020577 is about 427.3034368739.

The spelling of 78020577 in words is "seventy-eight million, twenty thousand, five hundred seventy-seven".